Put log4j.properties file under common

Author: sryza

yarn/alpha/src/main/resources/log4j-spark-container.properties renamed to yarn/common/src/main/resources/log4j-spark-container.properties

@@ -167,6 +167,12 @@
 
     <outputDirectory>target/scala-${scala.binary.version}/classes</outputDirectory>
     <testOutputDirectory>target/scala-${scala.binary.version}/test-classes</testOutputDirectory>
+  
+    <resources>
+      <resource>
+        <directory>../common/src/main/resources</directory>
+      </resource>
+    </resources>
   </build>
 
 </project>